<!DOCTYPE html>
<html lang="en">

<head>
   <meta charset="utf-8">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

 

    <title>Title</title>
</head>

<body>
<input type="text">
<button class="set">存数据</button>
<button class="get">de数据</button>
<button class="remove">移除数据</button>
<button class="del">清除数据</button>
    <script>
        var ipt = document.querySelector('input');
        var set = document.querySelector('.set');
        var get = document.querySelector('.get');
        var remove = document.querySelector('.remove')
        var del = document.querySelector('.del');
        set.addEventListener('click',function() {
            var value = ipt.value;
            sessionStorage.setItem('unamme',val);
        });
get.addEventListener('click',function(){
    console.log(sessionStorage.getItem('uname'));
});
remove.addEventListener('click',function() {
    sessionStorage.removeItem('uname');
});
    </script>
</body>
</html>